而不是尝试输出到控制台， Log 将输出到LogCat，您可以在Eclipse中找到： Window-> Show View->其他... - > Android-> LogCat

Rather than trying to output to the console, Log will output to LogCat which you can find in Eclipse by going to: Window->Show View->Other…->Android->LogCat

看看参考日志 。

使用LogCat的好处是您可以根据日志类型打印不同的颜色，例如： Log.d 打印蓝色， Log.e 打印橙色。另外，您可以通过 日志标记 ， 日志消息 ， 过滤ID 和/或 应用程序名称 。当您只想看到应用程序的日志并将其他系统的内容分开时，这非常有用。

The benefits of using LogCat are that you can print different colours depending on your log type, e.g.: Log.d prints blue, Log.e prints orange. Also you can filter by log tag, log message, process id and/or by application name. This is really useful when you just want to see your app's logs and keep the other system stuff separate.